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Characterizing polymeric methylene diphenyl diisocyanate reactions with wood. 2, Nano-indentation

Year:

2010

Publication type:

Miscellaneous Publication

Primary Station(s):

Forest Products Laboratory

Source:

Wood Adhesives 2009 [electronic resource]. FPS proceedings no. 7216-09. Madison, WI : Forest Products Society, c2010 [1 CD-ROM]: p. 366-373: ISBN: 9781892529572: 1892529572.

Description

In Part 1 of this study, two-dimensional solution-state nuclear magnetic resonance spectroscopy (2D solution NMR) found no covalent bonds between wood polymers and polymeric methylene diphenyl diisocyanate (pMDI) under the experimental conditions used. However, 2D solution NMR could not identify whether or not pMDI had entered the cell wall and if so, whether it polymerized in situ to create a polyurea interpenetrating polymer network (IPN). Here in Part 2, we employ recently developed nano-indentation techniques to assess the properties of cell walls in pMDI-infiltrated wood. The elastic modulus and hardness of the cell walls increased after pMDI modification, suggesting that pMDI infiltrated the cell walls to form a polyurea IPN inside the cell walls.

Citation

Jakes, J.E.; Yelle, D.Y.; Beecher, J.F.; Frihart, C.R.; Stone, D.S. 2010. Characterizing polymeric methylene diphenyl diisocyanate reactions with wood. 2, Nano-indentation. Wood Adhesives 2009 [electronic resource]. FPS proceedings no. 7216-09. Madison, WI : Forest Products Society, c2010 [1 CD-ROM]: p. 366-373: ISBN: 9781892529572: 1892529572.

Publication Notes

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https://www.fs.usda.gov/treesearch/pubs/56508